问题补充：
It’s a good way to control how many minutes your child talking on his cell and texting.
A. take
B. spend
C. costs
D. spends
答案：
A. take
B. spend
C. costs
(答案→)D. spends
解析：此题重点考查cost，spend，pay，take四个花费的区别；cost的主语是物常用句型结构是sth cost some money；spend的主语是人，常用的句型结构是sb spend some time/money in doing sth; pay的主语是人，常用句型结构是sb pay something some money；take的主语是it，常用句型结构是it takes sb some time to do sth
